I found some starmaps of Duniverse made by fans based on DUNE appendix information. The relative position of the star systems are real, when FH gave us the star names of where the planets are located, these names were related to real stars. Enjoy it:

Thats cool, something I've been interested in for a while. I mean the Emperor was the Emperor of the known Universe, I wasn't sure if the Landsraad was all in the same Galaxy. With fold space and the Title of known universe it kind of suggests that the imperium expands more than just the milky way galaxy.

No, the links Freak put up are fake/incorrect. The universe is actually just one galaxy, everything else is an optical illusion and is only really believed by the few unreliable scientists who aren't scientologists.

No, the links Freak put up are fake/incorrect. The universe is actually just one galaxy, everything else is an optical illusion and is only really believed by the few unreliable scientists who aren't scientologists.